Harris tabor



(No Model.) 2 Sheets-Sheet 1.

H. TABOR.

MOLDING MACHINE.

No. 448,596. Patented Mar. 17, 1891.

Witnesses: G. (R Shem Inventor v but M-WW,

Attorney (No ModeL) 2 Sheets--She et :2. H'. TABOR.

MOLDING MACHINE.

No. 448,596. PatentedMqr. 17, 1891.

g k wa- QL Q g; UIlMHIMIIiIMMIBHlILIL W Inventor a W ZV 'YM QAL \M Attorney rena trims,

HARRIS TABOR, OF ELIZABETH, NE? JERSEY, ASSIGNOR TO THE TAlBOR MANUFACTURING COMPANY, OF NEW YORK, N. Y.

MOLDING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 448,596, dated March 1'7, 1891. Application filed December 15, 1390. Serial No. 374M330 (No model.) I

To all whom it may concern: inder-head, this piston-rod being of large size Be it known that I, HARRIS TABOR, of and great stiffness, as in the preferred design Elizabeth, Union county, New Jersey, have this piston-rodfurnishes the sole guide for invented certain new and useful Improvethe lower member of the press; 5, a plate se- 5 mentsin Metal-Founding Machines, of which cured to the upper end of the piston-rod; 6, the following is a specification. an open-topped box of which the plate forms This invention pertains to that class of the bottom, this box forming what I will call molding presses employed by the metalthe head of the press, this head supporting founder in compacting the sand in his molds, the patternand flask, &c., and by its upward lo and the improvements will be readily undermovement compressing the sand against an stood from the following description, taken opposing press memberor follower above the in connection with the accompanying drawflask 7, gaps in two opposite side walls of the ings, in whichbox or head to permit of the vertical play of Figure 1 is a side elevation of a metalparts which have vertical movement inde- 15 founding machine exemplifying my improvependent of the head; 8, a rectangular frame 1nents, this View showing the machine as in resting upon or secured to the top of the box, open position and having on it the half-flask this frame being intended to have secured to and sand-box ready to be filled with sand; it the usual pattern employed in machines of Fig.2,afront elevationof the machine,shown this general class, it being usual, in such 20 partly invertical section,in the plane of line molding-presses, to arrange the pattern for a; Fig. 3, a front elevation similar to Fig. 2, attachment to the pattern-carrying element but without any parts appearing in section; of the press, this frame being hereinafter Fig.4, a side elevation, similar to Fig. 1,showtermed the pattern-frame, 9, spurs projecting, however, only what may be called the ing a short distance upward from the pat- 25 head of the machine, this view showing tern-frame; 10, a rectangular frame resting the parts as they would be when the pattern on these spurs, this frame being intended was withdrawn from the mold; Fig. 5, a verto have secured to it or formed with it the tical section of the head of the machine in usual stripping-plate, the preference, how the plane of line b; and Fig. (i, a plan of the ever, being that the frame be treated as a 30 head of the machine without strippingplate part of the machine and adapted to have at or flask, and showing portions broken away tached to it such stripping-plates as the to more clearlyillustrate the relation of parts. work in hand calls for, this frame being In following the literal description referhereinafter termed the stripping plat-e ence may be most conveniently had to Figs. frame; l1,vertical guide-sockets formed upon 5 1 and 2, reference being had to the other each side of the head or box 6, these sockets figures in exceptional cases. being closed at their lower ends, as seen in Referring to the drawings, 1 indicates a cyl- Fig. 5; 12, guide-stems attached to the stripinder adapted to produce the ramming power ping-plate frame and projecting downwardly by the use of air or water or steam, my. preftherefrom into the guide-sockets, as best seen 4o erence, however, being steam; 2, the piston in Fig.4;13,air-portsleadingoutwardlyfrom 9c thereof; 3, the inlet to the cylinder for steam the guidesoekets near their lower ends, but or other medium employed, this inlet being at such height that thcguide-stems will reach below the piston, and it being understood down past the air-ports when the stripperthat this inlet will be provided with a suit plate frame rests upon the spurs 9; it, the

45 able valve, by means of which the steam may usual stripper-plate resting upon and prefer- 9 5 be admitted to or allowed 1'0 exhaust from ably attached tothe stripper-plate frame; 15, the cylinder, according as it is desired. that the usual contour-hole in the stripping-plate, the piston rise or fall 5 a, the piston-rod, prothis hole being of such form. as to closely fit ject-ing from the piston up out of the cylinaround the pattern to which it belongs; 1G,

5o der and through a guide in the upper cylthe half-flask resting, as usual, on the stripcan in the sandbox, disposed directly over the i cross-bars in the half-flask and havinga thickness in excess of the bars of the half-flask; 20, the top cross-beam of the press, forming the op posing agent against which the risingand falling head exerts its pressure; ll, strain-rods for supportingthc top cross-beam, these rods being pivoted at the base of the machine, so thatthe top part of the press can be swung back out of the way; 29, the top rammer or follower attached to the cross-beam and designed to press upon the sandin the sand-box and compact the sand in the half-flask, this follower being merely a rectangular block of a size to enter the sand-box, the follower being, if desired, a permancntpart of the press, but preferably a separable part, changeable to suit various sizes of flasks in hand; 23, grooves in the lower surface of thefollowerof a width and depth adapting the follower to pass down through the sand-box to the level of the top of the half-flask, the cross-bars of the sand-box entering the grooves of the follower; 2i, a pipe orchannel extending through the piston and piston-rod from the lower portion of the cylinder to within the presshead; 95, a closed cavity extending around within the body of the pattern-frame 8; 20, a pipe placing this cavity in communication with the pipe 24:, whereby steam from the cylinder is always in free communication with the cavity, thus keeping the pattern-frame, and such pattern as may be on. the pattern-frame, warm, the warming of the pattern being found to be a decided advantage in enabling the pattern to be readily withdrawn from the compacted sand of the mold; 27, a pair of hangers secured to the stripping-plate frame 10, and projecting downwardly therefrom outside the pattern-frame 8, the bases of these hangers projecting somewhat into the head through the gaps 7 in the side walls of the head or box; 2b, a plate resting on the inward projections of the hangers and becoming thus disposed normally near the floor of the box or head and some distance below the patternframe b; 29, a rock-shaft supported in bearings on the upper head of the cylinder and extending across the front of the machine;

30, a lever-toe at each end of the rock-shaft,

the movement of the rock-shaft bringing these toes either vertically over the rock-shaft or forward from such position, as desired; 31, levers, one at each side of the head or box, the rear ends of these levers being pivoted to the box nlule the free forward ends are at liberty to sweep in an are passing through the point of occupancy of the lever-toes 30 when those toes are in their upward position; 32, links pivoted at their upper ends to the hangers 27, and at theirlower ends to intermediate portions of the levers ill; 33, a footlever on the rock-shaft; 3-1, a hand-lever, or two of them, on the rock-shaft.

Referring to Fig. 2, let it be assumed that the pattern-frame 8 carricsthe usual pattern, that portion of the pattern structure which forms the pattern proper projecting up through the contour hole 15 in the strippingpiate, the pattern proper thus occupying the usual position above the stripping-plate and withinthehalf-tlask. Thehalf-flaskandsandbox will be filled with sand, as usual,and the follower brought into position over the sand box. Steam will now be admitted under the piston,and the entire lower press in ember, carried by the upper end of the piston-rod, will rise and the follower will forcibly enter the sandbox and press the sand out of the same and into the half-flask, compressing it tightly in the half-flask and around the pattern and on top of the stripping-plate. This finishes the pressing operation and the halfanold is completed, but still in the press and with the pattern still in the mold. If now the steam be let out of the cylinder, then the parts which have risen will again descend and the press will be opened and the follower may be swung rearwardly out of the way; but this leaves the completed half-mold still in the press and the pattern still in the mold, for there has been no withdrawal of the pattern. \Vhat is wanted is that the flask and stripping-plate shall be held up while the pattern is withdrawn downwardly. The want is often provided for in molding-presses; but I provide for it by means of a peculiar system. When the head, &c., is in its upward position and the ramming completed, the levers 31 (see Fig. 1) will have risen also, rising bodily and not turning on their pivots. The parts will have risen so far that the rock-shaft may be turned so that lever-toes 30 are beneath the free ends of the levers 31. Now under these conditions when the steam is allowed to exhaust from the cylinder the head will descend, as before described, and the patternframe and attached pattern will descend with it to the normal position. As the head descends, so also will the levers 31 descend, the pivots of those levers being upon the head; but the forward ends of the levers cannot descend, being supported by the lever-toes. The consequence is that the lever-toes form new fulcrums for the levers 31, and that as the head descends the forward ends of the lovers do not descend, but the rear ends of the levers make the full descent, intermediate portions of the levers descending through less distance and at lower speed. The links connect the intermediate portions of the levers with the stripping-plate frame, and the result is that while the head or box and the pattern and the rear pivots of the levers have made the full descent the stripping-plate frame has made only a partial descent, as shown in Fig. 4. The stripping-plate and mold have descended somewhat, but the main head and pattern have made a full descent; conscquently the pattern has been withdrawn downwardly through the stripping-plate, leaving the half-mold ready for removal from the press. The stripping -plate frame normally rests on the spurs 9, made spurlike or nearly sharp, so that sand will not be apt to lodge upon them and prevent the stripper-plate frame resting fairly upon them, the resting of the stripping-plate frame on these spurs controlling the proper normal relationship of stripping-plate to pattern. As the head moves down in advance of the stripping-plate frame the spurs leave the stripping-plate frame, which becomes supported entirely by the links, and the guide-studs in the sockets insure the proper parallel movement and position of the parts. When the flask has been removed, then the rock-shaftis tripped by hand or foot, thus removing the levcr'toes from under the levers 31, where upon the stripping-plate frame is at liberty to drop and rest again upon the spurs, thus putting the stripping-plate again in normal relationship to the pattern ready for the placing of anew half-flask. \Vhen the rock-shaft is tripped, then the stripping -plate frame might come down upon the spurs with serious shock. This I obviate by causing the lower ends of the guide-studs to pass the air-holes 13 in the guide-sockets, thus penning up air in the guide-sockets and producing a cushion to relieve the shock, the penned-up air slowly leaking past the guide-studs and allowing the stripping'plate frame to come fairly down upon the spurs.

It is well understood that the strippingplate may deal with the exterior of a pattern, but that if a pattern has a ring-like form or has interior surfaces which require stripping, then recourse must be had to independent patches of stripping-plate, which must be supported from below the pattern, these independent stripping-patches being termed stools. Should any of the usual stools be required they may be supported on the stoolplate 28. (Best shown in Fig. 2.) This plate is supported by the lower ends of the hangers, and thus forms a portion of the strippingplate structure and partakes of its movements. The stool-patches will be carried, as usual, on studs extending upward from the stool-plate 28, the patches being level with the stripping-plate, as usual. here stools are not to be provided for there will of course be no necessity for the stool-plate 28 or for the arrangement of hangers and gaps for its support, andin such cases the box-like structure 6, which I have provided to give space under the pattern-frame for the movement of the stool-plate, will not be required, and the pattern-frame may rest directly on the table or plate 5.

The rock-shaft arrangement is an eliicient device for bringing the obstructing toes under the levers; but any other "suitable arrangement of these toes whereby they obstruct or do not obstruct the descent of the free ends of the levers may be employed.

Instead of employing the pressure-cylinder as a means for forcibly raising the head, any of the mechanical devices usually employed in metal-founding processes may be substituted.

I claim as my invention 1. In metal-founding apparatus, the combination, substantially as set forth, with a press and pattern support, of a stripping-plate supported by the pattern-support, and mechanism for moving the pattern-Sn pport and stripping-plate simultaneously, but at differing velocities. V

2. In metal-founding apparatus, the combination, substantially as set forth, with a press and a pattern-supporting press-head moved thereby, of a stripping-plate supported by the press-head, a lever pivoted to the presshead,alink connecting the lever with the stripping-plate, and a movable toe to obstruct the movement of one end of the lever.

In metal-founding apparatus, the combination, substantially as setforth, of a box-like press-head, a pattern-frame carried thereby, a stripping plate frame carried by the presshead, a stoolplate within the press head, hangers connecting the stool-plate with the stripping-plate frame, a follower, and means for independently moving the pattern-frame and stripping-plate frame as the press opens.

4:. In metal-founding apparatus, the combination, substantially as set forth, of a presshead arranged to support a pattern and provided with guide-sockets, a stripping-plate frame provided with guide'studs engaging said guide-sockets, a follower, and means. for pressing said press-head and follower toward each other 5. In metal-founding apparatus, the combination, substantially as set forth, of a presshcad provided with guide-sockets having airports, a stripping-plate frame having guidestuds engaging said guide-sockets, a follower, and means for pressing said press-head and follower toward each other.

6. In metal-founding apparatus, the combination, substantially as set forth, with a presshead, a follower, and means for pressing them toward each other, of a pattern-frame supported by the press-head and provided with upwardly-projecting spurs, and a strippingplate supported by said spurs.

7. In metal-founding apparatus, the combination, substantially as set forth, of a press, a pattern-frame having a closed cavity, and a steam-pipe communicating with such cavity.

8. In metal-founding apparatus, the combination, substantially as set forth, of a steamcylinder, a piston therein, a piston-rod hav ing through it a passage communicating with the steam-space of the cylinder, a patternframe carried by the piston-rod and having half-flask, a follower arranged to enter the sand-box,and means for pressing the follower x0 and press-head toward each other.

HARRIS TABOR.

A. W. MACK,

I Witnesses:

i t. M. PERRINE. 

